The Tcpdump Group git mirrors - tcpdump/blob - print-timed.c

   1 /*
   2  * Copyright (c) 2000 Ben Smithurst <ben@scientia.demon.co.uk>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 /* \summary: BSD time daemon protocol printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include "netdissect.h"
  31 #include "extract.h"
  32
  33 /*
  34  * Time Synchronization Protocol
  35  *
  36  * http://docs.freebsd.org/44doc/smm/12.timed/paper.pdf
  37  */
  38
  39 struct tsp_timeval {
  40         uint32_t        tv_sec;
  41         uint32_t        tv_usec;
  42 };
  43
  44 struct tsp {
  45         uint8_t         tsp_type;
  46         uint8_t         tsp_vers;
  47         uint16_t        tsp_seq;
  48         union {
  49                 struct tsp_timeval tspu_time;
  50                 int8_t tspu_hopcnt;
  51         } tsp_u;
  52         int8_t tsp_name[256];
  53 };
  54
  55 #define tsp_time        tsp_u.tspu_time
  56 #define tsp_hopcnt      tsp_u.tspu_hopcnt
  57
  58 /*
  59  * Command types.
  60  */
  61 #define TSP_ANY                 0       /* match any types */
  62 #define TSP_ADJTIME             1       /* send adjtime */
  63 #define TSP_ACK                 2       /* generic acknowledgement */
  64 #define TSP_MASTERREQ           3       /* ask for master's name */
  65 #define TSP_MASTERACK           4       /* acknowledge master request */
  66 #define TSP_SETTIME             5       /* send network time */
  67 #define TSP_MASTERUP            6       /* inform slaves that master is up */
  68 #define TSP_SLAVEUP             7       /* slave is up but not polled */
  69 #define TSP_ELECTION            8       /* advance candidature for master */
  70 #define TSP_ACCEPT              9       /* support candidature of master */
  71 #define TSP_REFUSE              10      /* reject candidature of master */
  72 #define TSP_CONFLICT            11      /* two or more masters present */
  73 #define TSP_RESOLVE             12      /* masters' conflict resolution */
  74 #define TSP_QUIT                13      /* reject candidature if master is up */
  75 #define TSP_DATE                14      /* reset the time (date command) */
  76 #define TSP_DATEREQ             15      /* remote request to reset the time */
  77 #define TSP_DATEACK             16      /* acknowledge time setting  */
  78 #define TSP_TRACEON             17      /* turn tracing on */
  79 #define TSP_TRACEOFF            18      /* turn tracing off */
  80 #define TSP_MSITE               19      /* find out master's site */
  81 #define TSP_MSITEREQ            20      /* remote master's site request */
  82 #define TSP_TEST                21      /* for testing election algo */
  83 #define TSP_SETDATE             22      /* New from date command */
  84 #define TSP_SETDATEREQ          23      /* New remote for above */
  85 #define TSP_LOOP                24      /* loop detection packet */
  86
  87 #define TSPTYPENUMBER           25
  88
  89 static const char tstr[] = "[|timed]";
  90
  91 static const char *tsptype[TSPTYPENUMBER] =
  92   { "ANY", "ADJTIME", "ACK", "MASTERREQ", "MASTERACK", "SETTIME", "MASTERUP",
  93   "SLAVEUP", "ELECTION", "ACCEPT", "REFUSE", "CONFLICT", "RESOLVE", "QUIT",
  94   "DATE", "DATEREQ", "DATEACK", "TRACEON", "TRACEOFF", "MSITE", "MSITEREQ",
  95   "TEST", "SETDATE", "SETDATEREQ", "LOOP" };
  96
  97 void
  98 timed_print(netdissect_options *ndo,
  99             register const u_char *bp)
 100 {
 101         const struct tsp *tsp = (const struct tsp *)bp;
 102         long sec, usec;
 103
 104         ND_TCHECK(tsp->tsp_type);
 105         if (tsp->tsp_type < TSPTYPENUMBER)
 106                 ND_PRINT((ndo, "TSP_%s", tsptype[tsp->tsp_type]));
 107         else
 108                 ND_PRINT((ndo, "(tsp_type %#x)", tsp->tsp_type));
 109
 110         ND_TCHECK(tsp->tsp_vers);
 111         ND_PRINT((ndo, " vers %u", tsp->tsp_vers));
 112
 113         ND_TCHECK(tsp->tsp_seq);
 114         ND_PRINT((ndo, " seq %u", tsp->tsp_seq));
 115
 116         switch (tsp->tsp_type) {
 117         case TSP_LOOP:
 118                 ND_TCHECK(tsp->tsp_hopcnt);
 119                 ND_PRINT((ndo, " hopcnt %u", tsp->tsp_hopcnt));
 120                 break;
 121         case TSP_SETTIME:
 122         case TSP_ADJTIME:
 123         case TSP_SETDATE:
 124         case TSP_SETDATEREQ:
 125                 ND_TCHECK(tsp->tsp_time);
 126                 sec = EXTRACT_32BITS(&tsp->tsp_time.tv_sec);
 127                 usec = EXTRACT_32BITS(&tsp->tsp_time.tv_usec);
 128                 /* XXX The comparison below is always false? */
 129                 if (usec < 0)
 130                         /* invalid, skip the rest of the packet */
 131                         return;
 132                 ND_PRINT((ndo, " time "));
 133                 if (sec < 0 && usec != 0) {
 134                         sec++;
 135                         if (sec == 0)
 136                                 ND_PRINT((ndo, "-"));
 137                         usec = 1000000 - usec;
 138                 }
 139                 ND_PRINT((ndo, "%ld.%06ld", sec, usec));
 140                 break;
 141         }
 142         ND_TCHECK(tsp->tsp_name);
 143         ND_PRINT((ndo, " name "));
 144         if (fn_print(ndo, (const u_char *)tsp->tsp_name, (const u_char *)tsp->tsp_name + sizeof(tsp->tsp_name)))
 145                 goto trunc;
 146         return;
 147
 148 trunc:
 149         ND_PRINT((ndo, " %s", tstr));
 150 }